Malicious PDF — malware analysis report

Static analysis result for SHA-256 861212925fe7917e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 20:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2a6732a53261dcf6c76454bda9d4477 SHA-1: c0ad8be5f79d81db063f16e8b894c444ca9fa542 SHA-256: 861212925fe7917e101030f5561e25aca5ae9a4b731f7cdb025f63660b0d4cfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document likely serving as a lure for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=nissan+leaf+owners+manual+uk PDF link annotation
    • http://adabaskimerkezi.com/upload/file/dopubuxawex.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nizizudixuxux.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/69506750819.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/at3hgmlmviolrrk5cikpbqfder/21067889388.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160917ba0ee4df---bakadaninuxupasi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160758b81cd4e3---82583498294.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/18057019464.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/76355309842.pdfIn PDF document text
    • http://mav-auto.ru/images/file/burezapukadereweg.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/verekudawegitukelixageke.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/52cf7273c92a54aee29f66b3457514f7/sidowowojajidogenazi.pdfIn PDF document text
    • http://dzbnf.com/upload/file///piveruzavebefif.pdfIn PDF document text
    • http://belean.pl/userfiles/file/45399236011.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607224cc5179f---jozazorekadelakukegamusax.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/42504375101.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/48356705301.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/4d92470e149fb5b95b89ee43a4a70190/petutozuxibeligezulovema.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/waratezotubox.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620937131.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/fukajogukuleferugelej.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/36482338820.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f08a28f96fd2cdfc4062805d783bde72/kuranin.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/69706590396.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 10532 bytes
SHA-256: 93125952b57d6e205bae252faa45b0868c98c58ad1bd24d9681707988390819f
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 17784 bytes
SHA-256: 4988497b7da6e7b1e6a5f5bdeafc223df20db404d5cd5cb920bea722a45a80a7

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